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Old 16th August 2011, 09:25 AM   #1
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Default veneer on back of bb plywood

Veneer sites suggest it is essential to veneer or back the reverse side of any panel one veneers. for a speaker, this would imply someing on the inside face of the speaker panels, in my case bb plywood. the rational is to prevent differential moisture absorption. but i would be really worried about this creating voids or even loose edges to buzz. any experience wih whether this should be necesary?
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Old 16th August 2011, 11:25 AM   #2
marce is online now marce  United Kingdom
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Its keeps the laminate equal and avoids unequal stresses in the panel.
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Old 17th August 2011, 05:42 AM   #3
badman is offline badman  United States
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With solid, braced plywood cabs, you don't need it.
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Old 17th August 2011, 07:38 AM   #4
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i was hoping that was the answer
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Old 18th August 2011, 11:53 AM   #5
marce is online now marce  United Kingdom
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True, I've also wondered whether a 0.6mm layer of veneer would have much effect on 18mm plywood. I have done veneered MDF cabinets, and only done one side, as in the UK veneer is expensive, I wanted to use quilted maple for my current project, it would have cost me over 400!!! Used pre-veneered (American Black Walnut) MDF instead.
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Old 18th August 2011, 12:10 PM   #6
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To agree with others, vital if you're making something like cupboard doors, not needed for well braced box construction.
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Old 18th August 2011, 12:36 PM   #7
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Quote:
Originally Posted by badman View Post
With solid, braced plywood cabs, you don't need it.
agreed

But what I`do is to cross glue the veneer grain against the plywood top layer grain (the side You want to glue the veneer on), if possible.
This helps to avoid cracks in the veneer.
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Old 19th August 2011, 08:33 PM   #8
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The only purpose for 'balance veneer' is to prevent unbraced flat panels curling from differential tension arising from moisture movement. A 'balancing veneer' doesn't need to be the exact same quality as the finish at all - it can be anything with similar properties. Hence (at the low end!) you find melamine worktops with paper on the back of a chipboard core...

With good quality ply and a braced construction there's no need as already stated.
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